Music – Accessories – Teaching devices
Patent
1999-03-03
2000-04-04
Witkowski, Stanley J.
Music
Accessories
Teaching devices
G09B 1502
Patent
active
060463945
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a music score recognizing method which can achieve a high recognition rate without deleting the staff, and a computer-readable recording medium storing a music score recognizing program.
BACKGROUND ART
When recognizing notes, rests and other signs on a music score using a personal computer, a scanner, etc., a music score image is two-valued and read in, then the staff and paragraphs are recognized, then, after deleting the staff per paragraph, a given rectangular label for reading is set per sign to carry out pattern matching between such label data and label data prepared in a dictionary in advance so that the signs are recognized.
In the foregoing recognition method, however, the staff deletion also removes from the image those portions of the sign on the staff which are in abutment with the staff. Thus, the continuity of pixels is spoiled so that labeling of that sign can not be performed due to such division. As a result, there is a problem that a sign to be recognized can not be precisely recognized as one unitary sign. For solving this problem, a technique of holding divided images on the staff has been used. However, since this method is also not complete, the labeling failure due to the staff deletion can not be avoided, thereby to cause lowering of the recognition rate. Further, if noise remains at the time of the staff deletion, a plurality of signs which should be separate labels are pixel-coupled (label coupling) due to the noise so as to be extracted as one label, which adversely affects the recognition.
The present invention has been made in view of the foregoing problems of the prior art and provides a music score recognizing method which can achieve a high recognition rate without deleting the staff, and a computer-readable recording medium storing a music score recognizing program.
DISCLOSURE OF THE INVENTION
As a result of analyzing the foregoing problems, the present inventors have made the present invention shown below in consideration that if objects to be recognized are narrowed down to those signs, such as clefs, time signatures, abbreviations, accidentals and rests, whose height positions are fixed on the staff or whose height positions are fixed using the staff as a grid and whose featuring enabling ranges exist within the staff, those portions which can fully feature object images can be precisely label-extracted and those features which are reluctant to an influence of deformation, rubbing or staining can be extracted from obtained labels so that the precise recognition can be achieved without deleting the staff.
Specifically, a structure of the present invention (applicable also to a structure of a computer-readable recording medium according to claim 2) is basically characterized, in a music score recognizing method of reading an image of a music score and recognizing music signs therein to prepare data for playing or music score displaying, in that, as shown in later-described FIG. 3, projections onto a transverse axis are derived from a staff start position xs to a staff end position xe with respect to a given height section y1-y2, set per sign, based on staff positions and, if a width of a section x1-x2 where a value of the projection exceeds a given threshold value th1 exceeds another given threshold value th2, a rectangle surrounded by x1, x2, y1 and y2 is set to be a label for extracting a feature of the corresponding sign (label extracting function), that, as shown in later-described FIG. 4, sections in the height section y1-y2 which do not overlap with a staff image are set to be extracting sections in the label for obtaining peripheral features in a transverse direction, the peripheral features derived for a plurality of orders from left and right ends in each extracting section, and further, as shown in later-described FIG. 5, each extracting section is divided into a plurality of mesh sections which are set so as to partly overlap with each other in a height direction, and a mean value of the peripheral features
Kabushiki Kaisha Kawai Gakki Seisakusho
Witkowski Stanley J.
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